Gemmology
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Agate

A variety of chalcedony with layered structure.

Agate — specimen 0620
Agate — specimen 0620, photo © NMNHS

Material from ‘Repository’

19 specimens: 0619 — 3.92 ct, USA, Montana, Yellowstone River; 0620 — 3.78 ct, USA, Montana, Yellowstone River; 0119 — 4.42 ct, USA, Montana, Yellowstone River; 0124 — 4.37 ct, USA, Montana, Yellowstone River; 0382 — 2.04 ct, USA, Montana, Yellowstone River; 0371 — 2.57 ct, USA, Montana, Yellowstone River; 0372 — 2.68 ct, USA, Montana, Yellowstone River; 0392 — 2.64 ct, USA, Montana, Yellowstone River; 0393 — 2.53 ct, USA, Montana, Yellowstone River; 0324 — 3.95 ct, USA, Montana, Yellowstone River; 0325 — 4.02 ct, USA, Montana, Yellowstone River; 0611 — 23.20 ct, USA, Montana, Yellowstone River; 0258 — 0.98 ct, no precise locality [Africa]; 0419 — 0.38 ct, no precise locality [Africa]; 0111 — 2.70 ct, no precise locality [Africa]; 0112 — 3.00 ct, no precise locality [Africa]; 0250 — 1.43 ct, no precise locality [Africa]; 0321 — 2.60 ct, Brazil; 0322 — 2.25 ct, Brazil.


Gallery view